diff options
Diffstat (limited to 'BJC-Utils2/src/main/java/bjc/utils/data/Either.java')
| -rw-r--r-- | BJC-Utils2/src/main/java/bjc/utils/data/Either.java | 61 |
1 files changed, 45 insertions, 16 deletions
diff --git a/BJC-Utils2/src/main/java/bjc/utils/data/Either.java b/BJC-Utils2/src/main/java/bjc/utils/data/Either.java index aa38959..3ab4c00 100644 --- a/BJC-Utils2/src/main/java/bjc/utils/data/Either.java +++ b/BJC-Utils2/src/main/java/bjc/utils/data/Either.java @@ -26,9 +26,8 @@ public class Either<LeftType, RightType> * The value to put on the left * @return An either with the left side occupied */ - public static <LeftType, - RightType> Either<LeftType, RightType> fromLeft( - LeftType left) { + public static <LeftType, RightType> Either<LeftType, RightType> fromLeft( + LeftType left) { return new Either<>(left, null); } @@ -43,9 +42,8 @@ public class Either<LeftType, RightType> * The value to put on the right * @return An either with the right side occupied */ - public static <LeftType, - RightType> Either<LeftType, RightType> fromRight( - RightType right) { + public static <LeftType, RightType> Either<LeftType, RightType> fromRight( + RightType right) { return new Either<>(null, right); } @@ -55,7 +53,7 @@ public class Either<LeftType, RightType> private boolean isLeft; - private Either(LeftType left, RightType right) { + private Either( LeftType left, RightType right) { if (left == null) { rightVal = right; } else { @@ -67,14 +65,21 @@ public class Either<LeftType, RightType> @Override public <BoundLeft, BoundRight> IPair<BoundLeft, BoundRight> bind( - BiFunction<LeftType, RightType, - IPair<BoundLeft, BoundRight>> binder) { + BiFunction<LeftType, RightType, IPair<BoundLeft, BoundRight>> binder) { + if (binder == null) { + throw new NullPointerException("Binder must not be null"); + } + return binder.apply(leftVal, rightVal); } @Override public <BoundLeft> IPair<BoundLeft, RightType> bindLeft( Function<LeftType, IPair<BoundLeft, RightType>> leftBinder) { + if (leftBinder == null) { + throw new NullPointerException("Left binder must not be null"); + } + if (isLeft) { return leftBinder.apply(leftVal); } @@ -85,6 +90,11 @@ public class Either<LeftType, RightType> @Override public <BoundRight> IPair<LeftType, BoundRight> bindRight( Function<RightType, IPair<LeftType, BoundRight>> rightBinder) { + if (rightBinder == null) { + throw new NullPointerException( + "Right binder must not be null"); + } + if (isLeft) { return new Either<>(leftVal, null); } @@ -93,13 +103,20 @@ public class Either<LeftType, RightType> } @Override - public <OtherLeft, OtherRight, CombinedLeft, - CombinedRight> IPair<CombinedLeft, CombinedRight> combine( - IPair<OtherLeft, OtherRight> otherPair, - BiFunction<LeftType, OtherLeft, - CombinedLeft> leftCombiner, - BiFunction<RightType, OtherRight, - CombinedRight> rightCombiner) { + public <OtherLeft, OtherRight, CombinedLeft, CombinedRight> IPair<CombinedLeft, CombinedRight> combine( + IPair<OtherLeft, OtherRight> otherPair, + BiFunction<LeftType, OtherLeft, CombinedLeft> leftCombiner, + BiFunction<RightType, OtherRight, CombinedRight> rightCombiner) { + if (otherPair == null) { + throw new NullPointerException("Other pair must not be null"); + } else if (leftCombiner == null) { + throw new NullPointerException( + "Left combiner must not be null"); + } else if (rightCombiner == null) { + throw new NullPointerException( + "Right combiner must not be null"); + } + if (isLeft) { return otherPair.bind((otherLeft, otherRight) -> { return new Either<>(leftCombiner.apply(leftVal, otherLeft), @@ -116,6 +133,10 @@ public class Either<LeftType, RightType> @Override public <NewLeft> IPair<NewLeft, RightType> mapLeft( Function<LeftType, NewLeft> mapper) { + if (mapper == null) { + throw new NullPointerException("Mapper must not be null"); + } + if (isLeft) { return new Either<>(mapper.apply(leftVal), null); } @@ -126,6 +147,10 @@ public class Either<LeftType, RightType> @Override public <NewRight> IPair<LeftType, NewRight> mapRight( Function<RightType, NewRight> mapper) { + if (mapper == null) { + throw new NullPointerException("Mapper must not be null"); + } + if (isLeft) { return new Either<>(leftVal, null); } @@ -136,6 +161,10 @@ public class Either<LeftType, RightType> @Override public <MergedType> MergedType merge( BiFunction<LeftType, RightType, MergedType> merger) { + if (merger == null) { + throw new NullPointerException("Merger must not be null"); + } + return merger.apply(leftVal, rightVal); } } |